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EGS: About Fallon FORGE

The Fallon FORGE site, located in Fallon, Nevada, is one of two candidate sites for FORGE (Frontier Observatory for Research in Geothermal Energy), and is funded by the U.S. Department of Energy (DOE) Geothermal Technologies Office. The site is situated within U.S. Naval Air Station Fallon and lands leased by Ormat Nevada Inc. Previous geothermal exploration/development was conducted at this site, but, due to limited well production, it never proved to be a commercial hydrothermal site. Today the site will serve as a field lab where the Fallon FORGE team (led by Sandia National Laboratories) will develop and test methods of stimulation for enhanced geothermal systems (EGS).

At some of the DOE EGS sites, small events have been associated with water injection (e.g., microearthquakes [MEQ]).

NOTE: At this time, because no injection has occurred, any seismicity displayed on the map below is naturally occurring seismicity, which is common for this part of Nevada. Induced seismicity may occur after periodic injection experiments have begun; periodic injection experiments are scheduled to start in 2018.

Currently there is a 10-station MEQ array that was installed by the U. S. Navy several years ago, but since installation has detected very little local seismicity within the FORGE site. This array was upgraded by the Fallon FORGE team and put into operation on November 1, 2016, and it has been in continuous operation since then. The upgraded array was designed to detect MEQ activity down to magnitude minus 1.0 events (-1.0) and to send event data in real time to this website (refer to interactive map below).

If Fallon, Nevada, is selected as the final FORGE site, this array will be augmented with deep monitoring holes (> 6,000 feet) and intermediate monitoring boreholes. These will be used to monitor very small events (< - 2.0) associated with water injection experiments.

For more detailed information about the Fallon FORGE program, please go to

EGS: Interactive, Real-Time Map of Earthquakes at Fallon, Nevada

The purpose of this web page is to provide to the public unbiased information in close to real-time on the occurrence of small earthquakes within the Fallon FORGE site during the lifetime of the FORGE project. The seismicity figures below are displayed in the Plan View on a Google Earth map and in a 3D scatterplot. Because injection of water will be several times a year, for a few weeks at a time, the seismicity will most likely correspond to these time periods only; however, this web page will be operational and available to the public 24 hours a day, 365 days a year.

How To Use This Page (Plan View)

On the map below, several different icons are displayed. Place your cursor over the “legend box,” and the definitions of these icons will appear. Some icons shown on the map will show more information in a pop-up box if you click on them.

In addition to displaying the individual microearthquakes, you can select different time periods to display the data (i.e., the current day, week, month or all data), as well the magnitude ranges (i.e., greater than magnitude 0, greater than 1, greater than 2, greater than 3, or all magnitudes). To do so, see the two small rectangular drop down menu boxes just above the plan view display under "filter earthquake data."

Last, but not least, the "base map" under the icons is a standard Google Earth display (latest version) and it can be manipulated just as you would any satellite or map view in Google Earth or Google Maps (i.e., you can zoom in [+] or out [-] and pan across). Also, depending on the zoom level you select, the scale is displayed at the very bottom of the Google map (Note: It is small!). The default scale is metric (km or m), but it can be changed to the English scale (feet/miles) by "clicking on" the scale itself. Note: You can only zoom to one level above ground level; however, if Google has mapped the street (usually main highways) you can drag the Street View's yellow man icon to the street to use Google Street View.

Desert Peak Geothermal Field Legend
Filter Earthquake Data

Seismicity in 3D

The 3D scatterplot (will appear below if an event has occurred) correlates to the selection of filters of earthquake data (number of days and magnitude range) on the interactive Google map (above). Use your mouse to click on the 3D scatterplot to rotate the image and zoom in or out. Clicking on the bottom-right corner of the plot allows you to resize the window. The units of depth are kilometers (Note: 0.0 km is sea level).

For a point of reference, 0 (0.0 km) is sea level on the vertical scale. All depth locations above 0 are in reference to sea level, whereas negative numbers denote distance below sea level. The elevation at the FORGE site is about 4,000 feet (about 1,219 meters) above sea level.

The magnitude scale shown below the 3D scatterplot is automatically scaled to the largest event displayed, i.e., unlike the 2-d plots, this scale will change with different magnitude ranges. You can click on any event on the 3D scatterplot and obtain the same information (date, latitude, longitude, depth, and magnitude) as you would for the corresponding earthquake event on the Google map.

Please note: The 3D visualization provided is implemented using the canvasXpress library, which employs the html5 canvas element in order to simulate 3D without any special download or plugin. This will only work on the latest, most current browsers. If you are having problems viewing the plot and have an older browser, we highly recommend either upgrading your browser or installing the latest version of a different browser (e.g., Mozilla Firefox or Google Chrome).